scholarly journals Top condensation model: a step towards the correct prediction of the Higgs mass

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
A. A. Osipov ◽  
B. Hiller ◽  
A. H. Blin ◽  
F. Palanca ◽  
J. Moreira ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Higgs Mass ◽  
Proper Time ◽  
Direct Consequence ◽  
Higgs Doublet ◽  
Electroweak Symmetry Breaking ◽  
Correct Prediction ◽  
Electroweak Symmetry ◽  
Composite Higgs ◽  
Mass Formulas

AbstractA realization of the composite Higgs scenario in the context of the effective model with the $$SU(2)_L\times U(1)_R$$ S U ( 2 ) L × U ( 1 ) R symmetric four-Fermi interactions proposed by Miransky, Tanabashi and Yamawaki is studied. The model implements Nambu’s mechanism of dynamical electroweak symmetry breaking leading to the formation of $${{\bar{t}}}t$$ t ¯ t and $${{\bar{b}}}b$$ b ¯ b quark condensates. We explore the vacuum structure and spectrum of the model by using the Schwinger proper-time method. As a direct consequence of this mechanism, the Higgs acquires a mass in accord with its experimental value. The present prediction essentially differs from the known overestimated value, $$m_\chi = 2m_t$$ m χ = 2 m t , making more favourable the top condensation scenario presented here. The mass formulas for the members of the second Higgs doublet are also obtained. The Nambu sum rule is discussed. It is shown that the anomalous $$U(1)_A$$ U ( 1 ) A symmetry breaking modifies this rule at next to leading order in $$1/N_c$$ 1 / N c .

scholarly journals Dynamical electroweak symmetry breaking in the model of electroweak-scale right-handed neutrinos

2016 ◽  
Vol 31 (11) ◽  
pp. 1650065
Author(s):  
Pham Quang Hung ◽  
Nguyen Nhu Le
Keyword(s):  
Symmetry Breaking ◽  
Higgs Doublet ◽  
Higgs Mechanism ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Electroweak Scale ◽  
Text Model ◽  
The Rich ◽  
Higgs Fields

We present the Higgs mechanism in the context of the EW-scale [Formula: see text] model in which electroweak symmetry is dynamically broken by condensates of mirror quark and right-handed neutrino through the exchange of one fundamental Higgs doublet and one fundamental Higgs triplet, respectively. The formation of these condensates is dynamically investigated by using the Schwinger–Dyson approach. The occurrence of these condensates will give rise to the rich Higgs spectrum. In addition, the VEVs of Higgs fields is also discussed in this dynamical phenomenon.

scholarly journals TWO COMPOSITE HIGGS DOUBLETS: IS IT THE LOW ENERGY LIMIT OF A NATURAL STRONG ELECTROWEAK SYMMETRY BREAKING SECTOR?

2010 ◽  
Vol 25 (06) ◽  
pp. 423-429 ◽  
Author(s):  
ALFONSO R. ZERWEKH
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Top Quark ◽  
Gluon Fusion ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Associated Production ◽  
Composite Higgs ◽  
Main Production ◽  
Model Scheme

In this paper, we propose an effective model scheme that describes the electroweak symmetry breaking sector by means of composite Higgs-like scalars, following the ideas of Minimal Walking Technicolor (MWT). We argue that, because of the general failure of Extended Technicolor (ETC) to explain the mass of the top quark, it is necessary to introduce two composite Higgs bosons: one of them originated by a MWT–ETC sector and the other produced by a Topcolor sector. We focus on the phenomenological differences between the light composite Higgs present in our model and the fundamental Higgs boson predicted by the Standard Model and their production at the LHC. We show that in this scheme the main production channel of the lighter Higgs boson is the associated production with a gauge boson and WW fusion but not the gluon–gluon fusion channel which is substantially suppressed.

scholarly journals Is SMEFT enough?

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Timothy Cohen ◽  
Nathaniel Craig ◽  
Xiaochuan Lu ◽  
Dave Sutherland
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Independent Set ◽  
Higgs Doublet ◽  
New Physics ◽  
Effective Field ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Goldstone Bosons ◽  
The Standard Model

Abstract There are two canonical approaches to treating the Standard Model as an Effective Field Theory (EFT): Standard Model EFT (SMEFT), expressed in the electroweak symmetric phase utilizing the Higgs doublet, and Higgs EFT (HEFT), expressed in the broken phase utilizing the physical Higgs boson and an independent set of Goldstone bosons. HEFT encompasses SMEFT, so understanding whether SMEFT is sufficient motivates identifying UV theories that require HEFT as their low energy limit. This distinction is complicated by field redefinitions that obscure the naive differences between the two EFTs. By reformulating the question in a geometric language, we derive concrete criteria that can be used to distinguish SMEFT from HEFT independent of the chosen field basis. We highlight two cases where perturbative new physics must be matched onto HEFT: (i) the new particles derive all of their mass from electroweak symmetry breaking, and (ii) there are additional sources of electroweak symmetry breaking. Additionally, HEFT has a broader practical application: it can provide a more convergent parametrization when new physics lies near the weak scale. The ubiquity of models requiring HEFT suggests that SMEFT is not enough.

scholarly journals INVESTIGATIONS OF ELECTROWEAK SYMMETRY BREAKING MECHANISM FOR HIGGS BOSON DECAYS INTO FOUR FERMIONS

2020 ◽  
pp. 8-12
Author(s):  
T.V. Obikhod ◽  
E.A. Petrenko
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Gluon Fusion ◽  
Higgs Doublet ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Decay Modes ◽  
Significant Difference ◽  
Vector Bosons ◽  
Breaking Mechanism

Models with extended Higgs boson sectors are of prime importance for investigating the mechanism of electroweak symmetry breaking for Higgs decays into four fermions and for Higgs-production in association with a vector bosons. In the framework of the Two-Higgs-Doublet Model using two scenarios obtained from the experimental measurements we presented next-to-leading-order results on the four-fermion decays of light CP-even Higgs boson, h → 4f. With the help of Monte Carlo program Prophecy 4f 3.0, we calculated the values Γ = ΓEW/(ΓEW + ΓSM) and Γ = ΓEW+QCD/(ΓEW+QCD + ΓSM) for Higgs boson decay channels H → νµµeνe, µµee, eeee. We didn’t find significant difference when accounting QCD corrections to EW processes in the decay modes of Higgs boson. Using computer programs Pythia 8.2 and FeynHiggs we calculated the following values: σ(V BH)BR(H → ZZ) and σ(V BF)BR(H → WW) for VBF production processes, σ(ggH)BR(H → WW) and σ(ggH)BR(H → ZZ) for gluon fusion production process at 13 and 14 TeV and found good agreement with experimental data.

scholarly journals DYNAMICAL ELECTROWEAK SYMMETRY BREAKING IN STRING MODELS WITH D-BRANES

2010 ◽  
Vol 25 (13) ◽  
pp. 2679-2698 ◽  
Author(s):  
NORIAKI KITAZAWA
Keyword(s):  
Symmetry Breaking ◽  
Strong Coupling ◽  
Higgs Doublet ◽  
Electroweak Symmetry Breaking ◽  
Kinetic Term ◽  
Electroweak Symmetry ◽  
Gauge Bosons ◽  
S Parameter ◽  
String Models ◽  
Gauge Interaction

The possibility of dynamical electroweak symmetry breaking by strong coupling gauge interaction in models with D-branes in String Theory is examined. Instead of elementary scalar Higgs doublet fields, the gauge symmetry with strong coupling (technicolor) is introduced. As the first step of this direction, a toy model, which is not fully realistic, is concretely analyzed in some detail. The model consists of D-branes and anti-D-branes at orbifold singularities in (T2 × T2 × T2)/Z3 which preserves supersymmetry. Supersymmetry is broken through the brane supersymmetry breaking. It is pointed out that the problem of large S parameter in dynamical electroweak symmetry breaking scenario may be solved by natural existence of kinetic term mixings between hypercharge U(1) gauge boson and massive anomalous U(1) gauge bosons. The problems to be solved toward constructing more realistic models are clarified in the analysis.

HIGGS DOUBLET AS COMPOSITE GOLDSTONE BOSON: CHALLENGE TO MULTI-TEV ENERGY COLLIDERS

1992 ◽  
Vol 07 (26) ◽  
pp. 6473-6492 ◽  
Author(s):  
YU. F. PIROGOV
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Goldstone Boson ◽  
Higgs Doublet ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Nonlinear Realization ◽  
Collider Phenomenology ◽  
Effective Lagrangian ◽  
The Standard Model

The minimum nonlinear extension SU(3)×U(1)/SU(2)×U(1) to the Standard Model, where the Higgs doublet is a composite Goldstone boson, is investigated. The canonical nonlinear realization of the extended symmetry is constructed in the form maximally close to that of the Standard Model. The corresponding most general effective Lagrangian is built. A simplest linear realization of the extended symmetry in an extended fermion sector is found. The Higgs-Goldstone scenario of the electroweak symmetry breaking is outlined from the standpoint of the multi-TeV energy collider phenomenology.

scholarly journals Tree level relations in a composite electroweak theory

2014 ◽  
Vol 29 (31) ◽  
pp. 1450166
Author(s):  
Amir H. Fariborz ◽  
Renata Jora ◽  
Joseph Schechter
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Top Quark ◽  
Electroweak Symmetry Breaking ◽  
Tree Level ◽  
Electroweak Theory ◽  
Electroweak Symmetry ◽  
Composite Higgs ◽  
Simple Tree

We work out simple tree level relations in a top condensate model with dynamical electroweak symmetry breaking. We find that in this picture the mass of the composite Higgs boson at tree level is given by [Formula: see text] where mt is the mass of the top quark.

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